You send a letter to an arcane mailbox that you are familiar with and that is on the same plane of existence as you. Most major cities have their post offices equipped with arcane boxes for public use. Some other important buildings may have one of their own as well. Each such mailbox includes a unique sigil sequence - a string of magical runes arranged in a particular pattern. When you first gain the ability to cast this spell, you learn the sigil sequences of three destinations on the Material Plane, determined by the DM. You can learn additional sigil sequences during your adventures. You can commit a new sigil sequence to memory after studying it for 1 minute.
You can create a permanent arcane mailbox by casting this spell in the same box (medium size) every day for one year. You need not send an arcane letter when you cast the spell in this way.
* - (a postage stamp worth at least 1 sp and 1 gp, all of which the spell consumes)
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